Skip to main content

OOW2010 Sunday

In the evening of this day Oracle had organised a cruise for all ACE's. At least for who that were on time....(sorry Jacco, had to mention it). It was good fun, a nice trip with beautiful views of San Francisco at night. We had to leave during Larry's keynote, that overrun an hour or so. Larry announced the Exalogic machine. Also called "your own private cloud". He mentioned that Facebook could run on two of those machines. But thinking of that: if Facebook needs two, who needs one? I guess the installed base will not be that big. But you can also buy "half a rack"! The other big thing was the announcement of the general availability of Fusion Apps in 2011Q1, 5 years after it was mentioned first. The third thing was the new unbreakable Linux kernel, to overcome the - according to Oracle - slow development of Linux by Redhat. I wonder what will be left for the Wednesday keynote...probably the new Java roadmap...
Before the keynotes, there were some user group sessions, which turned out to be very good. Especially the way Tim St Hilaire "forced" his organisation in defining real priorities using a Netflix like drag and drop interface was cool. Also Chris Muir's presentation on JMeter gave a lot of insight on when and how to do load and stress tests of web applications in general - and APEX or ADF ones in particular.
All in all it was a great day...and it was only a half one!

Comments

Anonymous said…
Thanks Roel, missing the boat (hur hur) was a nice lesson in anger management :)

Popular posts from this blog

apex_application.g_f0x array processing in Oracle 12

If you created your own "updatable reports" or your custom version of tabular forms in Oracle Application Express, you'll end up with a query that looks similar to this one: then you disable the " Escape special characters " property and the result is an updatable multirecord form. That was easy, right? But now we need to process the changes in the Ename column when the form is submitted, but only if the checkbox is checked. All the columns are submitted as separated arrays, named apex_application.g_f0x - where the "x" is the value of the "p_idx" parameter you specified in the apex_item calls. So we have apex_application.g_f01, g_f02 and g_f03. But then you discover APEX has the oddity that the "checkbox" array only contains values for the checked rows. Thus if you just check "Jones", the length of g_f02 is 1 and it contains only the empno of Jones - while the other two arrays will contain all (14) rows. So for

Filtering in the APEX Interactive Grid

Remember Oracle Forms? One of the nice features of Forms was the use of GLOBAL items. More or less comparable to Application Items in APEX. These GLOBALS where often used to pre-query data. For example you queried Employee 200 in Form A, then opened Form B and on opening that Form the Employee field is filled with that (GLOBAL) value of 200 and the query was executed. So without additional keys strokes or entering data, when switching to another Form a user would immediately see the data in the same context. And they loved that. In APEX you can create a similar experience using Application Items (or an Item on the Global Page) for Classic Reports (by setting a Default Value to a Search Item) and Interactive Reports (using the  APEX_IR.ADD_FILTER  procedure). But what about the Interactive Grid? There is no APEX_IG package ... so the first thing we have to figure out is how can we set a filter programmatically? Start with creating an Interactive Grid based upon the good old Employ

Stop using validations for checking constraints !

 If you run your APEX application - like a Form based on the EMP table - and test if you can change the value of Department to something else then the standard values of 10, 20, 30 or 40, you'll get a nice error message like this: But it isn't really nice, is it? So what do a lot of developers do? They create a validation (just) in order to show a nicer, better worded, error message like "This is not a valid department".  And what you then just did is writing code twice : Once in the database as a (foreign key) check constraint and once as a sql statement in your validation. And we all know : writing code twice is usually not a good idea - and executing the same query twice is not enhancing your performance! So how can we transform that ugly error message into something nice? By combining two APEX features: the Error Handling Function and the Text Messages! Start with copying the example of an Error Handling Function from the APEX documentation. Create this function